Transparent inorganic thin-film electroluminescent display element and method for manufacturing it

摘要

An inorganic, transparent thin film electroluminescent display element with a display area having at least one emissive area and at least one non-emissive area, improved in terms of transparency and inconspicuousness is provided, as well as a method for its preparation. The structure according to the invention comprises a substrate (40), a first conducting layer (42), a first insulating layer (45), a luminescent layer (46), a second insulating layer (47), a second conductive layer (43) and a third insulating layer (44) comprising insulating, inorganic material. Emissive and non-emissive areas of the display are rendered optically similar by providing passive film elements (50) at the non-emissive areas, namely by providing conductor material also at these areas when the conductive electrodes connected to a power source for generating the required voltage are deposited at the emissive areas.

主权项

1. An inorganic, transparent thin film electroluminescent display element with a display area having at least one emissive area and at least one non-emissive area, the display element comprising a layer structure on a substrate, said layer structure comprising
a first conducting layer comprising transparent conductive material, having a thickness in the range 30-250 nm, a first insulating layer comprising insulating, inorganic material, a luminescent layer comprising zinc sulfide, having a thickness in the range 30-250 nm, a second insulating layer comprising insulating, inorganic material, a second conducting layer comprising transparent conductive material, having a thickness in the range 30-250 nm, a third insulating layer comprising insulating, inorganic material having a lower refractive index than that of the second conducting layer,characterized in that each of said first and second conducting layers comprises at least one conductor element at the at least one emissive area and at least one passive film element at the at least one non-emissive area.